Southern California -- this just in

Riverside County prosecutors probing the battery allegations against Lindsay Lohan by a Betty Ford Center medical technician are also seeking to determine whether anyone tried to prevent the woman from cooperating with authorities, according to a source familiar with the probe.

Technician Dawn Holland initially told Riverside County sheriff's investigators that when she tried to administer an alcohol test on Lohan on Dec. 12, the actress grabbed her wrist and hurt it. Later that month, Holland spoke to TMZ.com and restated the allegation, leading the Betty Ford Center to fire her for breach of confidentiality.

Holland then had a change of heart and informed authorities through a Beverly Hills lawyer that she did not want to pursue the matter because as a recovering addict herself, she sympathized with Lohan.

Authorities were frustrated last week at being unable to interview Holland, the source said, and are looking into whether someone was blocking Holland from talking to them.

In the last few days, she got a new attorney, who told The Times that Holland will fully cooperate with authorities.

Authorities are determining whether to charge Lohan for the incident at Betty Ford, which could also be a parole violation for the star.

Lohan spent three months at the Betty Ford Center under orders by Los Angeles County Superior Court Judge Elden S. Fox, who spared the actress jail time in October after she tested positive for drugs. He directed her to stay at the center through January.